Kitchen range



Nov. 15, 1949 w,-E. cRANs-roN, JR 2,487,855

KITCHEN RANGE Filed Aug. 11, 1947 4 Sheets-Sheet l Z n INVENTOR.'

' o WML/AM E Can/vsroN d.

ATTORNEYS.

Nov. 15, 1949 w. E. cRANsToN, JR

KITCHEN RANGE 4 Sheets-Sheet 2 Filed Aug. 11, 1947 Bief :AMW 5. R Y 0 EM m N. an M yl UB Nov. l5, 1949 w. E. cRANsToN, JR 2,487,855

KITCHEN RANGE Filed Aug. 11, 1947 4 Sheets-Sheet 3 wa Ww@ 4T TORNEYS.

Nov. 15, 1949 Filed Aug. 1l, 1947 W. E. CRANSTON, JR

KITCHEN RANGE 4 Sheets-Shee\l 4 JNVENTOR: WILL/AM f. CnA/wro/v c/A.

,4 T TORNE Ys.

Patented Nov. 15, 1949 UNITED STATES PATENT GFFICE KITCHEN RANGE WilliamE. Cranston, Jr., Los Angeles, Calif., as-

signer to Thermador Electrical Manufacturing Company, Los Angeles,Calif., a corporation of California 6 Claims.

My invention relates to a new and novel electrical range and electricalcircuit therefor.

An object of my invention is to provide a domestic electric range havingin combination with the usual hot plates and ovens a means forcirculating either warm or cool air about the kitchen which may becontrolled either manually or automatically by means of a time clockswitch.

A further object of my invention is to provide a new and novel means formounting an air warming and circulating means in the cabinet of anelectrical range.

I have provided a heating element which is located adjacent the. frontof the fan which warms air passing over it when energized. It will beunderstood by those skilled in the art that when the electrical heatingelement is energized for the purpose oi distributing warm air about thekitchen, the speed of the fan must be relatively slow but that the ianmust be run at a relatively higher speed in order to effectivelyfunction as a cooling medium.

A further object of my invention is to provide an air heating and flowinducing means as an integral part of a range wherein the air iiowinducing means operates at relatively slow speeds while the heatingmeans is energized, but which operates at relatively higher speed whenfunctioning as a cooling or Ventilating means.

A still further object of my invention is to provide an air heating andflow inducing means which may be readily installed in a range cabinet asa unitary structure and which may be easily removed for servicing.

Other and further objects and advantages of my invention will becomeapparent from the drawings and specications relative thereto.

In the drawings:

Figure 1 is an isometric drawing of a range embodying my invention.

Figure 2 is an elevational View from the back showing the details ofmounting for the heating and air circulating means.

Figure 3 is a sectional view taken on line 3-3 of Figure 1.

Figure 4 is an enlarged sectional detail of the mounting panel for theair heating and circulating means.

Figure 5 is a schematic electrical diagram of my new and novelelectrical range.

Figure 6 is a schematic diagram showing the details of the oven controlswitch.

Figure 7 is a schematic diagram showing the details of the electricplate switches.

Figure 8 is a schematic diagram of the two speed control circuit for thefan.

Referring speciiically to the drawings, Figure 1 represents a rangeadapted for domestic use which embodies the features of my invention andcomprises essentially a cabinet, designated generally Ill, having a topplate II, a back guard I2, electrical resistance type heating elementsI3 disposed in the top II, switches I4 for controlling the heatingelements I3, a convenience outlet I5, a work light I6, a time controlclock Il, and a room heating and cooling unit I8.

The cabinet I0 is of usual construction and has an oven door 20, awarming oven 2|, and utility drawer 22.

Referring more specifically to Figures 2, 3 and 4, the heating andcooling unit I8 comprises an electrical resistance element 25 mounted ona frame 26. It will be understood by those skilled in the art that theelement 25 must be insulated by any suitable or conventional manner fromthe frame 26. Such methods are well known in the art, the details ofwhich may comprise radial supports 25a formed of mica or other suitablematerial. A motor 21 having a shaft 28 is disposed concentric with theelements 25 and is adapted to rotate a fan 29 which is disposed in frontof the element 25 and adapted to cause upon rotation a flow of air pastthe coil 25. The motor 2l is suspended from the frame 26 by the radialsupports 30. The heating and cooling unit just described is mountedbehind the louvers 3I by means to be described later. Terminals 32, 33and 34 are provided to connect the electrical circuit, which will beexplained later, to the heating unit and motor 2l.

The details of the mounting for the heater and fan and louver panel I8are shown in Figures 2, 3 and 4. The louver panel is formedin twosections I8a and I8b. Section I8a is a substantially rectangular shapedpanel having inturned flanges 35 around the periphery thereof and formedwith a centrally disposed aperture 36 adapted to receive the louveredsection I8b. The louvered section I8b is formed with inturned anges 3'I.

L-shaped brackets 38 are secured to the inturned flanges 35. A pair ofchannels 39 are secured to the brackets 38 and extend vertically thefull length of the panel I8. The channels 39 may be secured by anysuitable means, such as bolt 40 and nut and bolt assembly 4I. Suchmethod is preferred over spot Welding or the like because the panel I8aand the bracket 38 are usually covered with porcelain.

The channels 39 are formed with slots 42 and are adapted to recelvespring clips cl3 and 43a. The spring clips 43 and 43a, are L-shaped andhave the short leg of the L disposed through the slots 42 and bearagainst the channel 39. The long leg of the L is deformed into aV-shaped segment. In spring clip 43 the v is inverted; while in the-spr'ing clip ilia, the'V Lis'right side up.

The purpose of such an arrangement is apparent in Figure 3, where itwill be seen that the V of the spring clips are adapted to be spr-.ungbehind beams fill and d5 which constitute a part of the frame of thestove, thereby holding Apanel I8 securely in place.

A pair of brackets it extend 'outwardly and forwardly from the frame 26and are securely fastened to the channel merribers .35 .by such means asspot welding. A depending brace il is securely fastened to the frame 2Band extends downwardly to a point below the beam 45 where it is securedtothe 'base-oi the stove by means -of a bolt 48.

"Thus-it will be seen that the heating and ventiiating kmeans are'securely fastened 4into the stovetby `a. relatively simple arrangementand that the :assembly can 'be linstalled or removed by the manipulationlof but `one bolt.

VReferring more specically 'to 'Figure `5, `the electrical circuitcontained in my new and `novel range comprises a Vplurality ofelectrical hot plates 50, 51,52 and'53. Whereas, I have shownschematically .all of thehot plates as .being .the same,jilt will beunderstood that the size and type is optional or that one or more maybewhat yis termed .a deepwwell cooker, rather than a surface type. Each ofthe hot plates is formed with two resistance units designated A .and B.It will be understood that a reference to resistance `unit .50A

orLtB will .refer .to .the respective .resistance -elements fin theheating .plate '50. The rangeis also provided with a .broilingelement 54`anda roasting. element .55, both .disposed in the oven Z.

`,A-low heat .element 56 is disposed in the .warming oven `21. Theheating :and cooling unit lis represented in .Figure .5 :schematicallyand isdesignated .bythe same .numerals that is, resistance coil25andinotor 2l.

The fox/en `.circuit is vas follows: The source .of power, :such asservice from the mainvlines vof the house, .is :connected :to "aterminal block 65! and islof l.the usual three-wire service connectingto terminals rtl, `E2 Vand 53, .it @bei-ng .understood that lterminal.t2 is--what is'vcommonly termed as the-'neutral'. line.rv .The:terminal 6l Ais connected to the control clock ll by means ofAconductor 64 .rand :thence to the ,oven controlled :switch '65 bycon'ductor :16.6. Terminal l6.3 is 'connected l.to the control clockby.y conductor 6l and Vthence to them/en control switch $5 by=conductorte. The oven*controlswitch-'Sais connectedlto the'broiling and roastingelements :54..fand '55..in series with a thermal'overload v.protection69 of any standard or suitable type-2bymeans oflcon'ductors fle, Jil, I2:and 113;

Referring to Figure 6, I show the details Iof switch i655. Figure 1.6shows this-switch 'in lits four positions. Position. A .is the offposition where the zlines Gi :and 38 .are .not Iconnected .to `any ofthe iterminalsvof either 'elementEl .or Position B .shows .the switchi-with the switchingbusses $5 and .1l 6 .connected .in such .a .mannerthat both elements :5t and 1.55am sin parallel. vPosition .C shows`theiswitch :in position :where `busses 2t5 :and 76 are connectedonlyzto element 5d; .lElement255 is not energized. Position D shows theswitch in position where the switch busses 'l5 and 'IG are connected toelement 55 only and element 54 is de-energized. It will thus beunderstood that the oven has four stages; that is, oit, broil, bake orboth baking and broiling, and may be energized for fastheating of theoven compartment.

l`will yrbe understood 'that fthe "time control clock Il' may be of anystandard commercial type lhaving a two-pole switch with contacts A, B, Cand D. In the on position, contacts A and B are connected and contacts Cand D are connected. 'Bhe/clock motor operates on 110 volts and maybeconnected internally to either terminal A or C and has a'neutral.return by means of conductor 8i) to the terminal 62.

As -wi'llfbe moted in Figure 6, the control switch 65 is provided with aterminal 8| which is connected-'to conductor 66 in all three of the onpositions. The terminal 8l is connected to a conductor 82 -which:energizes la :pilot light '83, hereinrepresented asa neon :globe tube,it being understood, :of course, that any suitable vtype .pilot.lightican Abe used. 'The 1pil-ot 183 is provided with `a neutral return84 which connects -itto terminal 62. The Ioven is also provided witha`light 35 whichllis lcom-iected-.to :a standardfsingle pole switch '.86andlisenergized .by .means .of line 8.1 connected .to terminal lilv andconductor-88. The :oven light-85 has aneutra'l 'return .39 which is-.connected tto .terminal B2 by `vmeans l-of conductors 8d and 80.

The detail-s of the twitching :arrangement for the .surface electricplates I:3a're shownsin .Figure 7.. The. circuit V'cornpris'es a switch,designated generally '95). vI have =used 7a snap .switch which has .rivefstages; It ris understood ythat'fan-y :six- -stage switch with'suitable internal connections satisfactory. The vswitch SI1 `isconnected zto a source of. plower by means-.of lines 9.-l,.f.92 and `93.It will 'be understood that :the fall in potential between conductors-9l and S'Zfandbetween -93Jand 92 4is 1710 volts; .whereaathe fa-ll 4.inpotential between theconductors 9! and 9-3 is 220 volts. .The switchisprovided with switching :busses 94, -95 and 96,

.In vstage fE .the switch bus 94 connects `conductor ASM ,to bothresistance ele-ments EUAand 50B. It will be noted, however, `that l.theyother terminal :of 4.the elements .A and Bfare 1connected to conductor`93 byswitching bus .96, thereby -connecting the .elements A `and .Binparallel across. the .220 vol-ts land .g-ivingfa hie-h heating position.In position F, the -switching .bus -llconnects con ductor 9| .to element.A .and .switching bus .96' connects .the other terminal of element A toconductor. L93, .thereby connecting element A Lto the 220 volt circuit.Y

v Position G shows the ,elements A and B .connected in series across'the 220 volt circuitby vconnectingbusses 94 and 96 tothe elements AandB and conductors 93 and 91 Position I-Is-hows'the bus 9'6 connectingconductor `931:0 one terminal of element B, the otherterminal Vof Awhichiscon-4 nected to the neutralreturn 92"'by meansl oi bus 95. In positionJ, the elements A and-Parecennected in series across-the v1110 Voltcircuit lby means of busses 94 and 95. As will 'lbe seen in allpositions, E to J, inclusive, the bus 94 'iis also .connected 'toicon'ductortzf which, .as was `heretofore explained, energizespilotlight 83. '.No `.fo1T'po'si-. tion of th'e switch rll isfshown.y[tfwill be :understood that the..switching :arrangement .just :ex-vplained .is identical Tor the/elements 50,.;51, 2152 and 53. Each fof;the respectiveswitches are con@ 5 ectedto theconductors 9|, 92 and 93 inparallel.' The warming oven element 56 is energized by means of aconductor which is connected to conductor 9| through a double-pole-single-throw switch IOI and is connected to the neutral return 92. Thepurpose of having a double-pole singlethrow switch, designated |0I, isso that the pilot light 83 may be energized through conductor 82 whenthe warming oven 56 is energized without having a feed lback through'theelement 56.

The convenience outlet I is energized by means of conductor |02 througha fuse or other safety overload protection device |03 andconductor |04to terminal B of the controlclock I1. A neutral return |05 is connectedto conductor 92. Thus, it will be seen that the convenience outlet I5 iscontrolled by-the clock I1, the advantage of this being that a coffeemaker Aor similar device can be attached to the convenience outlet I 5and the clock I'I set for any desired time so that the coffee will bemade and ready for consuming when the user of the range is ready forbreakfast.

The room heating and cooling circuit as shown in Figure 8 comprises aswitch IIO, conductors III, II2 and I I3. The switch |I0 is asnap switchand comprisesfour stages having -switching busses |I5 and IIB. PositionK shows the 01T position. Position L shows the bus |I5 connecting theconductor 93 to conductor ||2, which energizes the motor 21 byconnecting it to conductor I I3 through a small section A of the heatingelement 25. It will be understood that the internal resistance of themotor 21 is large in comparison with the resistance of the section A ofthe element 25 so that the principal fall in potential betweenconductors ||3 and 93 will take place in the motor. The motor will,therefore, run at its maximum speed. The L position is the position inwhich the fan only operates, thereby acting as a means for cooling akitchen.

Position M shows the motor 21 and section B of the element 25 connectedin parallel, both of which are in series with section A of the element25. The bus |I5 connects conductor 93 to both conductors III and ||2.The resistance of sections A and B are so balanced that a substantialportion of the fall in potential takes place in section A; therefore,the fall in potential across the motor 21 is substantially less than 220volts. Hence, the motor 21 will operate at a slow speed while theresistance element 25 is energized. Position N shows the bus IIBconnected to a conductor IM and to the conductors III and I|2. Theconductor II4 is energized by being connected to terminal 63 through theelectric control clock I1. Thus, it will be seen that in position N, themotor 21 and heating element 25 are controlled by the time clock so thatif desired the user may turn the switch IIO to a position where themotor and heating element will be energized and set the clock I1 toenergize the motor 21 and heating element 25 at any desired time so thatthe kitchen will be warmed before the user arises.

A utility light I6 is energized by being connected to terminal 6|through conductor 64 to terminal A of the time clock through a conductor|20, switch I2I and a neutral return |22 which is connected .to theconductor 80 at the neutral terminal of the clock I'I.

A safety ground is provided for the oven elements by means of conductors|23 and |24 which are grounded at |25.

Having described my invention, what I claim as new and desire to secureby Letters Patent is:

1. In a domestic range having a cabinet formed with an open back and anaperture, an air heating and flow inducing unit mounted in said cabinetand adapted to cause a flow of air from said open back to said aperture,said air heat and flow inducing unit comprising a frame, an electricalresistance unit insulatedly mounted on said frame, an electrical fansupported by said frame and disposed adjacent said electrical resistanceunit and adapted to cause a flow of air by said resistance unit, and aplurality of spring clips adapted to secure said air heating and flowinducing means in said cabinet adjacent said aperture.

2. In a cabinet having an aperture therein, structural members deningsaid aperture, a panel having marginal portions adapted to overlie saidaperture and abut against said structural members, said panel beingformed with louvers for the transmission of air, a plurality of oppositely disposed resilient clips secured to said panel and adapted toengage said structural members and to hold said panel in position toenclose said aperture, a frame secured to said panel adapted to bepositioned inside said aperture when said panel is in position, anelectrical fan carried by said frame and adapted to cause a flow of airoutwardly from said cabinet through said louvers, an electricalresistance unit insulatedly mounted in said frame concentric with saidelectrical ian adapted upon energization to warm said aii` flowingthrough said louvers, and switching means adapted to selectivelyenergize said fan or said fan and said heating unit.

3. In a cabinet construction having a substantially rectangular aperturetherein defined by peripheral ledges, a panel adapted to overlie saidledges and completely enclose said aperture, said panel being formedwith a centrally disposed aperture, a louvered section having peripheralflanges and adapted to fit in said panel aperture with said angesunderlying said panel in abutting relation thereto, a plurality ofresilient clips secured to said panel and adapted to resiliently engagethe peripheral edges of said cabinet aperture to retain said panel inposition, a frame secured to said panel, an electrical fan adapted tocause a iiow of air from said cabinet through said louvered sectionsupported by said frame member, and an electrical resistance unitconcentric with said fan adapted to Warm the air flowing through saidlouvers.

4. An air flow inducing and heating unit adapted for installation in arectangular supporting frame having plain outwardly extending marginalsurfaces therefrom, said unit comprising a rectangular panel adapted toabut against and overlie the marginal surfaces of said frame, said panelbeing formed with a centrally disposed louvered section, a framesupported by said panel and adapted to support an electrical fanadjacent said louvered section to cause a ilow of air through saidlouvers upon energization of said fan, an electrical resistance unitsupported by said frame adapted to heat air flowing through saidlouvers, a plurality of resilient clips adapted to resiliently engagethe peripheral edges of said rectangular opening, and switching means toselectively energize said electrical fan or said electrical fan and saidresistance unit simultaneously.

5. An air flow inducing and heating unit adapted for installation in arectangular supporting frame having plain outwardly extendingallergens?.

said;- panel andcadaptedzto support: an electrical.

fanfadjacent Asaidzlouvered-rsectionpto cause a ow ofeairthroughsaidylouvers upon energizationfof said fan, an. electrical resistanceunitsup-g ported lby, saidrframe adapted lto -heat vair yflowing throughy.said louvers, resilient' means adapted toiresiliently engage-.at`least one peripheral edge of rsaid rectangularv opening, and switchingmeans toY selectively Aenergize said electrical --fan -or- Asaidelectrical fan and said resistance unit simultaneously.l

, 6. An air ow inducing and vheatingunit adapt-- edi-for installation-ini a rectangular rsupporting ramechaving plain outwardly` extendingmarV ginal surfaces therefrom, said unit comprisinga rectangular panelvadapted to abut against and. overliefthexmarginal `surfaces of :saidframe, saidV panel :being formed with fa centrally :disposed luv'eredsection, a frame supported by'sai'dpa'nel' and tadaptedto support anelectrical anfadjacent saidflouvered section tov causea ow of airithroughsaid :louvers upon energization =of .isaidfan, an electricalVresistance unit 'supported by said-frame fadapted to heat air owingthroughv said-louvers, and resilient means adaptedito'resilientlyengageatleast one peripheral edge ofi said rectangular opening.

WILLIAMf-E. CRANSTONy JR.

REFERENCES CITED The Yfollowing references are of record in the le of'4this patent:

UNITED STATES PATENTS Number Name Date 1,533,098 Carmean'et al. Apr.14:;1925' 1,1967-'.,-15'7 Losee July 24,1934 1,998,767-0:` Goshorn etal. Apr..23, 1935V 2,078,548- Strawser Apr. 27, 19374 2,120,795 'BoothbyJune 14, 1938 2,221,647 Mooney Nov. 12,1940`

